birdc-completion

# bash completion for birdc, supporting _most_ command paths, relevant for BGP and some default actions. RIP/OSPF/other protocols explicitly not supported
# License: MIT

_birdc_get_protocol_names() {
    birdc show protocols 2>/dev/null | awk 'NR>2 {print $1}'
}

_birdc_completions_show() {
    # Only jump into current level, if the current level is already finished
    local this_level=
    if [ "${COMP_CWORD}" -gt 2 ]; then
    	this_level="${COMP_WORDS[2]}"
    fi

    case "$this_level" in
        interfaces|interface|interfac|interfa|interf|inter|inte|int|in|i)
            COMPREPLY=()
            if [ "${COMP_CWORD}" -le 3 ]; then
                COMPREPLY=( $(compgen -W "summary" -- "$cur") )
            fi
            return 0
            ;;
        protocols|protocol|protoco|protoc|proto|prot|pro|pr|p)
            include_all_token=
            max_length=3
            include_sessions=

            if [ "${COMP_CWORD}" -le 3 ]; then
                include_all_token=all
            fi

            if [ "${prev}" = "all" ]; then
                max_length=4
            fi

            if [ "${COMP_CWORD}" -le "${max_length}" ]; then
                include_sessions="$(_birdc_get_protocol_names)"
            fi

            COMPREPLY=( $(compgen -W "${include_all_token} ${include_sessions}" -- "$cur") )
            return 0
            ;;
        symbols|symbol|symbo|symb|sym)
            COMPREPLY=( $(compgen -W "table filter function protocol template" -- "$cur") )
            return 0
            ;;
        route|rout|rou|ro|r)
            # FIXME this is not context aware at all
            COMPREPLY=( $(compgen -W "for in table import export filter where all primary filtered export preexport noexport protocol stats count" -- "$cur") )
            return 0
            ;;
    esac

    COMPREPLY=( $(compgen -W "babel bfd interfaces memory ospf protocols rip route static status symbols" -- "$cur") )
    return 0
}

_birdc_completions_protocols() {
    if [ "${COMP_CWORD}" -le 2 ]; then
        COMPREPLY=( $(compgen -W "all $(_birdc_get_protocol_names)" -- "$cur") )
        return 0
    fi
    COMPREPLY=()
    return 0
}

_birdc_completions_configure() {
    COMPREPLY=( $(compgen -W "soft timeout confirm undo status check" -- "$cur") )
    return 0
}

_birdc_completions()
{
    local cur="${COMP_WORDS[COMP_CWORD]}"
    local prev="${COMP_WORDS[COMP_CWORD-1]}"

    # Only jump into current level, if the current level is already finished
    local top_level=
    if [ "${COMP_CWORD}" -gt 1 ]; then
    	top_level="${COMP_WORDS[1]}"
    fi

    # Second-level completions
    case "$top_level" in
        configure)
            _birdc_completions_configure
            return 0
        ;;
        echo)
            COMPREPLY=( $(compgen -W "all off debug trace info remote warning error auth" -- "$cur") )
            return 0
            ;;
        enable|disable|restart|reload)
            _birdc_completions_protocols
            return 0
            ;;
        show)
            _birdc_completions_show
            return 0
            ;;
    esac

    # Intentionally ignored `down`, `graceful restart` commands
    COMPREPLY=( $(compgen -W "help show eval echo disable enable restart reload debug mrtdump configure" -- "$cur") )
    return 0
}

complete -F _birdc_completions birdc